A short-distance dual-node geomagnetic vehicle speed detection system and detection method

Abstract

The invention discloses a short-pitch two-node geomagnetic vehicle speed detecting system and detecting method. The method comprises the steps: collecting a geomagnetic signal at time of vehicle passing to obtain two waveforms with a time difference; preprocessing the waveforms, removing backgrounds, and carrying out standardizing processing; on the basis of a band pair searching method based on aslope deviation degree, determining a band pair meeting a following requirement in the waveforms, calculating a time difference at time of vehicle passing by a dual-geomagnetic sensor for each band,and acquiring a vehicle driving speed of the corresponding band pair by combining a sensor pitch; and carrying out traverse on all data of the waveforms, selecting out all band pairs meeting the following requirement, acquiring speeds corresponding to all bands, and using an average value of the speeds as the speed of vehicle passing. Therefore, problems of signal delay ununiformity caused by inconsistent electrical parameters of the two geomagnetic sensors and low time signal resolution caused by the short pitch are solved; and the vehicle speed detection is improved, the size is small, the power consumption is low, and the system is convenient to mount.

Description

technical field [0001] The invention belongs to the technical field of vehicle speed detection, in particular to a short-distance dual-node geomagnetic vehicle speed detection system and a detection method. Background technique [0002] At present, the rapid development of Internet technology has promoted the rise of many industries in the society. Smart cities aim to integrate technology into the lives of citizens, which is a hot spot in current development. Intelligent transportation is a key component of the development of smart cities. The detection of traffic status is the basic task of developing intelligent transportation. The speed of vehicles is one of the important parameters that intuitively reflect the traffic status and is indispensable for the coordination of various functions of the intelligent transportation system. Important indicators. Traffic managers can judge traffic congestion according to vehicle speed, and realize reasonable speed limit setting and s...

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Problems solved by technology

[0004] The purpose of the present invention is to provide a short-distance dual-node geomagnetic vehicle speed detection system and detection method, which can solve the problem of uneven signal time delay and low time signal resolution caused by short distances caused by the inconsistency of the electrical parameters of the two geomagnetic sensors. problem, improve the accuracy of vehicle speed detection, small size, low power consumption, easy to install

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